Pg. 44-45. Fort Riley limestone member of Barneston limestone of Chase group. Limestone, light-gray and tan, massive and thin-bedded, with minor amount of gray shale. Basal part contains thin, more or less shaly beds that are overlain by massive "rim rock," which contains fossil algae; thin shaly beds and locally clay shale deposits occur in middle part; upper strata rather massive but less so than the "rim rock." Thickness 30 to 45 feet. Underlies Holmesville shale member of Doyle shale. Age is Early Permian (Wolfcamp).